[ CVE-2026-121562 · Published 3 Nov 2026 ]
Vulnerability in CTFd
CVSS 5.3
EPSS <1%No fix listed yet
[ Description ]Official description
CTFd 3.1.0 before 3.8.7 contains an information disclosure vulnerability in the /api/v1/teams list endpoint that exposes non-public team custom field values. Unauthenticated attackers can paginate GET requests to collect hidden registration data such as emails, phone numbers, and student IDs when team mode and public visibility are enabled.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ References ]References
- blog.ctfd.io/ctfd-3-8-7
- github.com/CTFd/CTFd
- github.com/CTFd/CTFd/blob/3.8.6/CTFd/api/v1/teams.py
- github.com/CTFd/CTFd/blob/3.8.6/CTFd/schemas/teams.py
- github.com/CTFd/CTFd/commit/122c224030224ca6a04d2928280055a84bbd4850
- github.com/CTFd/CTFd/releases/tag/3.8.7
- www.vulncheck.com/advisories/ctfd-3.1.0-before-3.8.7-information-disclosure-via-api-v1-…